jordanrini
20.03.2020 •
Chemistry
Ammonia will decompose into nitrogen and hydrogen at high temperature. An industrial chemist studying this reaction fills a 200. mL flask with 3.4 atm of ammonia gas, and when the mixture has come to equilibrium measures the amount of nitrogen gas to be 1.5 atm. Calculate the pressure equilibrium constant for the decomposition of ammonia at the final temperature of the mixture. Round your answer to 2 significant digits.
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Ответ:
See explanation below
Explanation:
In this case, let's write the reaction first:
2NH₃ <> N₂ + 3H₂ Kp = ?
The problem states that we have 3.4 atm initially of ammonia. When the reaction reaches the equilibrium, the concentration of the nitrogen gas (one of the products) is 1.5 atm. All we need to know is the other values of the rest of species there, and then, we can calculate the equilibrium constant (Kp) for the reaction. To do that, we need to write the ICE chart for this reaction:
2NH₃ <> N₂ + 3H₂
i) 3.4 0 0
c) -2x +x +3x
e) 3.4-2x x 3x
The problem is already giving us the equilibrium pressure of the nitrogen, which is 1.5 atm. This would be the value of "x", so replacing in the rest of the species:
PpNH₃ = 3.4 - (2*1.5) = 0.4 atm
PpH₂ = 3*1.5 = 4.5 atm
Now that we have the values of the pressure, we can calculate Kp:
Kp = [H₂]³ [N₂] / [NH₃]²
Replacing the values:
Kp = (4.5)³ (1.5) / (0.4)²
Kp = 854.3
This would be the equilibrium constant value
Ответ:
C
Explanation: